Has anyone used one of the new Nvidia GT630 cards based upon the gk208 chip. It appears to be the lowest power graphics card with a lot of chip capabilities. I haven't found any reviews concentrating on htpc's. If anyone has further insights into how suitable it is for madvr etc. please chime in?
I don't want to start an argument about intel hd4000 etc. being good enough, for the sake of discussion assume it isn't.
GeForce GT 630 Kepler (GK208) has very limited memory bandwidth (because of 64-bit data path with DDR3; 128-bit or higher is common). Compare GFLOPS and memory bandwidth (the two most important factors for madVR performance):
GeForce GT 630 Kepler (GK208): 693 GFLOPS / 14.4 GB/s
GeForce GT 640 (GK107): 691 GFLOPS / 28.5 GB/s
GeForce GT 640 GDDR5 (GK208): 803 GFLOPS / 40.0 GB/s
GeForce GTX 650 (GK107): 813 GFLOPS / 80.0 GB/s
GeForce GTX 650 Ti (GK106): 1421 GFLOPS / 86.4 GB/s
GT 640 (GK107) can do madVR Level 5 for movies with GPU load < 60% and Level 3 for videos with GPU load < 60%. (The power consumption of the total system at video playback is ~70W, not that bad.) GT 630 Kepler (GK208) is worse than that.